
Refresh
Mechanical Fundamentals
(Slides given below)
TOM
The subject Theory of Machines may be defined as that branch of
Engineering-science, which deals with the study of relative motion between the various parts of
a machine, and forces which act on them. The knowledge of this subject is very essential for
an engineer in designing the various parts of a machine.
Sub- Divisions of TOM
-
Kinematics: It deals with the relative motion between the various parts of the machines.
-
Dynamics: It deals with the forces and their effects while acting upon the machine parts in Motion.
-
Kinetics: It deals with the inertia forces which arise from the combined effect of the mass and motion of the machine parts.
-
Statics: It deals with the forces and their effects while the machine parts are at rest. The mass of the parts is assumed to be negligible.
DEFINITIONS RELATED TO TOM
-
Kinematic Link
Kinematic link each part of a machine, which moves relative to some other part, is known as a kinematic link.
A link may consist of several parts, which are rigidly fastened together so that they do not
move relative to another part. For example, in a reciprocating steam engine, piston, piston
rod and crosshead constitute one link; connecting rod with big and small end bearings
constitute a second link; crank, crankshaft, and flywheel a third link and the cylinder, engine
frame and main bearings a fourth link.
-
Kinematic Pair
Kinematic pair: The two links of a machine, when in contact with each other, are said to form a pair. If the relative motion between them is completely or successfully constrained (i.e. in a definite direction), the pair is known as kinematic pair
-
Kinematic Chain
A kinematic chain is an assembly of links in which the relative motions of the links are possible
and the motion of each relative to the other
